<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>css</title>
    <style>
       #abcd{
        color: blue;
        background-color: burlywood;
       }
    font-size:20px;
    </style>
    <link rel="stylesheet" href="test.css">
</head>
<body>
    <span style="color:black;background-color: green;"font-size: 20px;>视频</span>
    <span id="abcd">网盘</span>
    <span id="lg">文库</span>
</body>
</html>